Use scatter plots to represent two quantitative variables and fit functions to model relationships.
Fit a quadratic-style model informally
Problem
What kind of informal quadratic model would fit this curved data: points decrease then increase, forming a U-shape?
Big Picture
What this problem is really about
A change from decreasing to increasing signals a turning point, which a line or a one-direction exponential curve cannot capture. Match that single turn to a quadratic form, then use whether the vertex is a minimum or maximum to determine how the parabola opens.
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